<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>BootStrap栅格系统</title>
<!--- link href="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.min.css"--->
    <link href="../static/css/bootstrap.min.css"
          rel="stylesheet" type="text/css">
    <meta name="viewport" content="width=device-width,initial-scale=1"/>
    <style>
        .row div {
            border: solid 2px royalblue;
        }
        .container{
            border: solid 5px blanchedalmond;
        }
        @media (min-width: 1300px) {
            .container{
                max-width: 1300px;
            }
        }
    </style>

</head>
<body>

<div class="container">
    <div class="row">
        <div class="col-9 col-12">你好，光民</div>
        <div class="col-3 col-12">你好，大哥</div>
    </div>
</div>
</body>
</html>